Improvement in ventilator-caps



P. J'. BELFORD. Ventilator-Gap.

No. 212,647.l Patented' Feb. 25,1879.

Y Www@ N.PETERS, FHOTO-LITHOGRAPHER, WASHINGTON, D. C.

'UNITEDv TATES PATENT OFFICE.

PHILIP J. BELFOBD,

or Nnw YORK, N. Y.

llVl PROVEM ENT lN VENTI LATO R-CAPS..

Specification forming part of Letters Patent NO. 212,647, dated February 25, 1879; application filed December 26, 1878.

To all whom it may concern:

Be it known that I, PHILIP J'. BELFoRD, of the city of New York, in the county and State of New York, have invented certain new and useful Improvements in Ventilator-Caps, of which the following is a specification:

My invention consists in a Ventilator-cap, preferably formed of sheet metal, adapted to be secured to the top of aventilatin g shaft or tube, and comprising an upwardly flaring dellector, surmounted by an upwardly contracted deflector, the two forming frustums of cones, united at their bases, and an internal upwardly-contracted deector, also forming a frustum of a cone, whereby wind striking the Ventilator-cap is deflected upward and downward, causing the air therein to expand, and maintaining a rapid draft in the shaft or tube.

In the accompanying drawings, Figure 1 represents a side elevation of a ventilatoreap embodying my improvements, and Fig. 2 a central Vertical section thereof.

Similar letters of reference designate corresponding parts in both figures.

A designates a Ventilating shaft or tube, near the top of which is secured an upwardlyflaring delector, B, forming a frustum of a cone. rIhis defleetor is fitted outside the shaft or tube, and is larger at the lower end than the said shaft or tube, so as to leave a space between the two.

G designates an upwardly-contracted delector, also forming a frustum of a cone, surrounding the defleotor B, and the upper end of which may be of about the size of the Ventilatorshaft or tube A.

D designates an upwardly-contracted deilector, also forming a frustum of a cone, secured to the Ventilator shaft or tube at the top, above the dellector B, within the dellector (l, and the upper end of which extends above the deileetor C. The deflector D is placed a little above the end of the shaft or tube, so as to leave an opening, a, between the two, through which air may pass out.

E designates a cap, forming a weather-cone, which extends over the Ventilator-cap, and prevents rain from falling down the shaft or tube.

It is obvious that wind striking the exterior of the dellectors B and C is dellected both upward and downward, and causes the foul air drawn through the opening a to escape at the top and bottom of said dellectors, asindicated by the arrows b. Wind which passes between the top of the dellector G and the weather-cone E strikes the internal delector D, and causes the air to pass out at the top of said delieetor, as indicated by the arrows o.

By my invention wind striking the cap is deflected by the surfaces of the three deflectors, and three drafts are created, causing the air to expand, and maintaining a strong draft through the Ventilating shaft or tube.

My improvements might be embodied in chimneycowls with advantage.

Vhat I claim as my invention, a-nd desire to secure by Letters Patent, is-

A Ventilator-cap adapted to be secured to the top of a Ventilating shaft or tube, and comprising an upwardly-flaring deflector, B, surmounted by an upwardly-contracted deflector, G, the two forming frustums of cones, united at their bases, and an internal upwardly-contracted deilector, D, also forming a frustum of a cone, substantially as and for the purpose specified.

PHILIP J. BELFORD.

Witnesses:

T. J. KEANE, FRED. HAYNES. 

